@article{etna_vol41_pp93-108,
  author  = {Klaus Neymeyr and Ming Zhou},
  title   = {The block preconditioned steepest descent iteration for elliptic operator eigenvalue problems},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {41},
  year    = {2014},
  pages   = {93--108},
}